Improvement in guards for door-knob screws



Patent ed Nov. 6, 1877.

MN fa da/Mu J6 N4 FETERS. FHO'T'O-LITHDGRAPHER.'WASHINGYON, D C

rrnn STATES P 'rEN'l CHARLES M. BAKER, 'OF WARWICK, NEW'YORK.

IMPROVEMENT IN GUARDS FOR DOOR-KNOB SCREWS.

Specification forming part of Letters Patent No. 196,858, dated November 6, 1877; application filed July 10, 1877.

To all whom it may concern Be it known that I, CHARLES M. BAKER, of Warwick, Orange county, State of New York, have invented an Improved Door-Knob- Screw Guard, of which the following is a full,

clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

as hereinafter particularly shown and de-- scribed, and recited in the claim.

Figure 1 is a side elevation of a squared shaft with the knob-sleeves secured thereon,

and showing my screw-guard clasped and locked in position on the sleeve, over the screw. Fig. 2 is a vertical sectional view on the line 00 00, Fig. 1. Fig. 3 is a similar view on the line y y, Fig. 1.

A is the squared shaft of the door-knobsf At B and G, on opposite ends of the shaft, are

shown the shanks or sleeves of the knobs, held on the shaft and secured thereto by theusual screws 1) and 0, respectively.

At D is shown my improved guard for preventing the escape from its seat of the knobscrew b or c, and the consequent loosening of the knob from the shaft. This guard 1 form of metal having a tension or spring, preferably of spring-steel, and I make it semi-cylindrical in shape, as shown, and in the form of a strip or ribbon. On the under or concave face of this semi-cylindrical metal strip I form a depression or recess, cl, adapted to receive the head of the screw 12 or c, as shown. This ribbon I clasp upon the circumference of the sleeve B or O, on the line of the screw I) orc, the head of the screw fitting into the depression or recess d, as set forth, the tension of metal ribbon acting to close the ribbon down snugly upon the sleeve.

To look the ribbon or guard in position, so that it will be immovable on the sleeve without unlocking, I employ either of the devices shown in the drawings.

Pins or studs 0 may be set in the sleeve, as I shown inFig. 3', and perforations (Pin the ends of the ribbon adapted to fit over the pins when the guard is sprimg into place; or the ends of the ribbon may be turned or projected inward, as at d, and recesses b, to receive the ends, formed in the sleeve, as shown in Fig. 2. These, or any other suitable locking device, may be employed, although either of those shown is preferable to riveting the guard at its ends, inasmuch as the devices shown render the guard easily adjustable upon the sleeve. 1

What I claim as my invention, and desire to secure by Letters Patent, isp The semi-cylindrical tension metal ribbon or guard D, havingtlie' recess 01 in its concave face, and provided with suitable locking device at its ends, whereby, when the guard is clasped about the sleeve 'of a door-knob, the

knob-screw is prevented from escaping from its seat, as described.

cHhRLEs M. BAKER.

Witnesses J OHN J. BEATTIE, JOHN MCWILLIAMS.

FFIGE. 

